#!@PYTHON_EXECUTABLE@
# -*- mode:python -*-
# vim: ts=4 sw=4 smarttab expandtab

import argparse
import logging
import os
import subprocess
import sys
import time

logging.basicConfig(level=logging.INFO)
log = logging.getLogger(__name__)


def parse_args():
    parser = argparse.ArgumentParser()
    parser.add_argument(
        '-p', '--path', default='/var/lib/ceph/crash',
        help='base path to monitor for crash dumps')
    parser.add_argument(
        '-d', '--delay', default=10.0, type=float,
        help='minutes to delay between scans (0 to exit after one)',
    )
    return parser.parse_args()


def post_crash(path):
    pr = subprocess.Popen(
        args=['timeout', '30', 'ceph', 'crash', 'post', '-i', '-'],
        stdin=subprocess.PIPE,
        stdout=subprocess.PIPE,
        stderr=subprocess.PIPE,
    )
    f = open(os.path.join(path, 'meta'), 'r')
    stdout, stderr = pr.communicate(input=f.read())
    rc = pr.wait()
    f.close()
    if rc != 0:
        log.warning('post %s failed: %s' % (path, stderr))
    return rc


def scrape_path(path):
    for p in os.listdir(path):
        crashpath = os.path.join(path, p)
        metapath = os.path.join(crashpath, 'meta')
        donepath = os.path.join(crashpath, 'done')
        if os.path.isfile(metapath):
            if not os.path.isfile(donepath):
                # hang out just for a bit; either we interrupted the dump
                # or the daemon crashed before finishing it
                time.sleep(1)
                if not os.path.isfile(donepath):
                    return
            # ok, we can process this one
            rc = post_crash(crashpath)
            if rc == 0:
                os.rename(crashpath, os.path.join(path, 'posted/', p))
                log.debug(
                    "posted %s and renamed %s -> %s " %
                    (metapath, p, os.path.join('posted/', p))
                )


def main():
    args = parse_args()
    postdir = os.path.join(args.path, 'posted')

    while not os.path.isdir(postdir):
        log.error("directory %s does not exist; please create" % postdir)
        time.sleep(30)

    log.info("monitoring path %s, delay %ds" % (args.path, args.delay * 60.0))
    while True:
        scrape_path(args.path)
        if args.delay == 0:
            sys.exit(0)
        time.sleep(args.delay * 60)


if __name__ == "__main__":
    main()
